xref: /llvm-project/llvm/test/Transforms/LoopLoadElim/non-const-distance.ll (revision 977c0a6d29fe836f75b64a6f08a58cb3c00a56d9)
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
2; RUN: opt -passes=loop-load-elim -S %s | FileCheck %s
3
4target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
5
6define void @non_const_distance(i64 %start, ptr %A, i1 %c) {
7; CHECK-LABEL: define void @non_const_distance(
8; CHECK-SAME: i64 [[START:%.*]], ptr [[A:%.*]], i1 [[C:%.*]]) {
9; CHECK-NEXT:  entry:
10; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[C]], i64 1, i64 0
11; CHECK-NEXT:    [[SEL_NOT:%.*]] = xor i64 [[SEL]], -1
12; CHECK-NEXT:    br label [[LOOP:%.*]]
13; CHECK:       loop:
14; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
15; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[A]], [[ENTRY]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP]] ]
16; CHECK-NEXT:    [[ADD_PTR:%.*]] = getelementptr i32, ptr [[PTR_IV]], i64 [[SEL_NOT]]
17; CHECK-NEXT:    [[L:%.*]] = load i32, ptr [[ADD_PTR]], align 4
18; CHECK-NEXT:    store i32 [[L]], ptr [[PTR_IV]], align 4
19; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
20; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr i8, ptr [[PTR_IV]], i64 4
21; CHECK-NEXT:    [[EC:%.*]] = icmp eq i64 [[IV]], 1000
22; CHECK-NEXT:    br i1 [[EC]], label [[EXIT:%.*]], label [[LOOP]]
23; CHECK:       exit:
24; CHECK-NEXT:    ret void
25;
26entry:
27  %sel = select i1 %c, i64 1, i64 0
28  %sel.not = xor i64 %sel, -1
29  br label %loop
30
31loop:
32  %iv = phi i64 [ %start, %entry ], [ %iv.next, %loop ]
33  %ptr.iv = phi ptr [ %A, %entry ], [ %ptr.iv.next, %loop ]
34  %add.ptr = getelementptr i32, ptr %ptr.iv, i64 %sel.not
35  %l = load i32, ptr %add.ptr, align 4
36  store i32 %l, ptr %ptr.iv, align 4
37  %iv.next = add i64 %iv, 1
38  %ptr.iv.next = getelementptr i8, ptr %ptr.iv, i64 4
39  %ec = icmp eq i64 %iv, 1000
40  br i1 %ec, label %exit, label %loop
41
42exit:
43  ret void
44}
45